grammer and punctuation is your friend
I am having trouble understanding, perhaps others are also.
your run on statement makes if very difficult
is your gun a "Cock on Closing"? as such the firing pin should not move until you close the bolt the last inch or so
is this when it slips? if so, DON"T FIRE THE GUN until it gets serviced as this could fire a round that is not fully in the chamber with bolt closed.
Sounds like someone tried to "Lighten" the trigger during the "Sporter" process and went hog wild